﻿#region Copyright (c) 2003 - 2008, Andreas Mueller
/////////////////////////////////////////////////////////////////////////////////////////
// 
// Copyright (c) 2003 - 2008, Andreas Mueller.
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// which accompanies this distribution, and is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// Contributors:
//    Andreas Mueller - initial API and implementation
//
// 
// This software is derived from software bearing the following
// restrictions:
// 
// Copyright (c) 1994
// Hewlett-Packard Company
// 
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  Hewlett-Packard Company makes no
// representations about the suitability of this software for any
// purpose.  It is provided "as is" without express or implied warranty.
// 
// 
// Copyright (c) 1996,1997
// Silicon Graphics Computer Systems, Inc.
// 
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  Silicon Graphics makes no
// representations about the suitability of this software for any
// purpose.  It is provided "as is" without express or implied warranty.
// 
// 
// (C) Copyright Nicolai M. Josuttis 1999.
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// 
/////////////////////////////////////////////////////////////////////////////////////////
#endregion

using System.Linq;
using NStl.Iterators;
using NStl.Linq;
using NUnit.Framework;

namespace NStl.NUnit.Support
{
    /// <summary>
    /// An abstract fixture to test any <see cref="IRandomAccessIterator{T}"/> implementation.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class RandomAccessIteratorFixture<T> : BidirectionalIteratorFixture<T>
    {
        protected override IBidirectionalIterator<T> CreateBidItBegin()
        {
            return CreateRndItBegin();
        }

        protected override IBidirectionalIterator<T> CreateBidItEnd()
        {
            return CreateRndItEnd();
        }

        protected abstract IRandomAccessIterator<T> CreateRndItBegin();

        protected abstract IRandomAccessIterator<T> CreateRndItEnd();

        public override void SetUp()
        {
            base.SetUp();

            rndBegin = (IRandomAccessIterator<T>)fwdBegin;
            rndEnd = (IRandomAccessIterator<T>)fwdEnd;
        }

        protected IRandomAccessIterator<T> rndBegin;
        protected IRandomAccessIterator<T> rndEnd;

        [Test]
        public void BeginPlus3()
        {
            T oldval = rndBegin.Value;
            IRandomAccessIterator<T> beginPlus3 = rndBegin.Add(3);

            Assert.AreEqual(oldval, rndBegin.Value);
            Assert.AreNotSame(beginPlus3, rndBegin);

            rndBegin.PreIncrement();
            rndBegin.PreIncrement();
            rndBegin.PreIncrement();

            Assert.AreEqual(rndBegin, beginPlus3);
        }
        [Test]
        public void EndMinus3()
        {
            IRandomAccessIterator<T> endMinus3 = rndEnd.Add(-3);

            rndEnd.PreDecrement();
            rndEnd.PreDecrement();
            rndEnd.PreDecrement();


            Assert.AreEqual(rndEnd, endMinus3);
        }

        [Test]
        public void Diff()
        {
            int diff = rndEnd.Diff(rndBegin);
            //int diffNeg = rndEnd.Diff(rndBegin);

            //Assert.Less(diffNeg, 0);
            //Assert.AreEqual(diff, diffNeg*-1);

            int count = rndBegin.AsEnumerable(rndEnd).Count();


            Assert.AreEqual(count, diff);
        }
        [Test]
        public void DiffIsNegative()
        {
            int diffNeg = rndBegin.Diff(rndEnd);

            Assert.Less(diffNeg, 0);

            int count = rndBegin.AsEnumerable(rndEnd).Count();

;
            Assert.AreEqual(count, -diffNeg);
        }

        [Test]
        public void Less()
        {
            Assert.IsTrue(rndBegin.Less(rndEnd));
            Assert.IsFalse(rndEnd.Less(rndBegin));
            Assert.IsFalse(rndBegin.Less(rndBegin));
        }
    }

}
